Input of the displacement map.
If the a color output is implicitly converted in the vector input,
the first channel (red) value determines displacement along X axis.
The second channel (green) the displacement along Y axis.
If the input is a grayscale image, where both the channel values are equal,
the input image will be displaced equally in both X and Y directions.

Scale X, Y

Separate scaling of the vector input in X and Y direction.
Acting as multipliers by increasing or decreasing the strength of
the displacement along their respective axes.